Yes, this is good advice! If I remember the podcasts correctly you should also re-test when you make a big change to other elements of your set up, e.g. if you significantly change your bike fit and/or swap out components like crank arms to different lengths.
Also having your power numbers match inside and out is a good goal and using the same power meter in both places is definitely a step up, but people commonly have different indoor and outdoor FTP estimates. Tempting as it is to head down the local velodrome and do an FTP test out there I’m not that keen on accuracy 